Photographers' Formulary Benzotriazole is used as an organic antifoggant and density depressant in developers.
Benzotriazole acts as a restrainer without affecting other properties of the developer. It can also be used as a fog restrainer when processing outdated papers.
When blue-black or cold-black image tones are desired with bromide papers, benzotriazole should be used in addition to, or substituted for, potassium bromide.
Make a 0.2% solution of benzotriazole (2g benzotriazole in water at 125°f/52°c or higher to make 1 liter) then reduce the bromide to 1/10 or 1/6 strength and use just enough benzotriazole solution to prevent developer stain or fog. A little experimentation may be required.
The same treatment can be applied to chloride and chlorobromide papers to eliminate any greenish black tendencies and/or achieve a blue-black tone.
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Aziminobenzene Benzisotriazole Edwal's Liquid Orthazite, which contains approximately a 3% solution of benzotriazole with sodium sulfite Kodak Anti-Fog #1 (no longer manufactured)
Colorless crystals or white powder
Organic antifoggant and density depressant in developers Fog restrainer when processing out dated papers
Benzotriazole does not dissolve readily in cold water. Use hot water 125°f/52°c or higher